Add pipeline for testing automation.

.github/workflows/build.yml

@@ -0,0 +1,23 @@
+name: Build and Test
+
+on:
+  push:
+    branches: [ initial-pipeline ]
+  pull_request:
+    branches: [ initial-pipeline ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 21
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Build with Gradle
+        run: ./gradlew build